So first of all, the shumika launcher is a big "go f**k yourself" to me personally, especially to someone who just probably got tachanka and used him for the first time. Sometimes his launcher can be useful in certain situations and you may be better at using it compared to myself... but what i find to be great in Tachanka's glorious loadout is his DP27 -

Info from R6 wiki -
The DP27 can pierce four surfaces (two full walls) before stopping on the fifth. It has high enough destruction power to break through wooden supports, allowing it to destroy wall beams and hatch beams much like a shotgun. Specifically for hatches, the DP27 can take out a hatch in no less than six well placed shots.

This gun is high powered asf with its high mag capacity of 70 and 49 damage per hit, its like 2-3 shots on someone and they doneski's this gun is great for people who are not that skilled in game, in general tachanka is amazing for someone who's just starting in my opinion, others would probably disagree.